Chess Stalker — Free Chess Opponent Analysis

Analyze any Lichess, Chess.com or FIDE player's openings, weaknesses, blunder patterns and psychological profile. Train against a Twin Bot that replicates your opponent's style. Search by username or FIDE ID across 11 million+ games. Free to use, no signup required.

What you get

Opponent weakness analysis — opening repertoire, common blunders, time pressure patterns
Twin Bot — practice against an AI clone of your opponent's exact playing style
FIDE OTB database — 11 million+ tournament games and 1.7 million+ rated players
Stockfish-powered analysis with depth-25 evaluations
Multi-platform: Lichess, Chess.com, and FIDE in one place
Head-to-head comparison, Nemesis detection, Stalker Score

How it works

Search any Lichess, Chess.com username or FIDE player
Get instant scouting report with weaknesses and patterns
Prepare your strategy and practice against the Twin Bot

GM

Xiong, Jeffery

USA USA·Born 2000·FIDE #2047640·5,758 Games

Classical26565,167 Games

Rapid2694327 Games

Blitz2703327 Games

Statistics

5758

Total

3304

Wins

1403

Draws

1046

Losses

57%24%18%

Play Style

What you need to know before facing them

Elite accuracy: 93.6% average

Solid conversion: 86%

Very consistent (89%)

Very precise: only 0.1 blunders/game

Dominates 1.b4 ♔ (88% in 30 games)

Deep Analysis

Stockfish 18 · Classical games · 729 analyzed

Accuracy by phase

Opening96.7%

Middlegame93.9%

Endgame95.4%

Clutch Factor

Performance under pressure

+5%

Winning (+2 or more)94%

207 Games

Equal position96%

210 Games

Losing (-2 or more)90%

83 Games

Problematic Pieces

Which pieces cause most errors?

♙

23%

82 errors

♖

21%

76 errors

♕

19%

67 errors

♔

14%

51 errors

♞

12%

45 errors

♗

11%

40 errors

Critical Moment

When does the first serious error occur?

Move 45average

1-15

16-25

26-35

36-45

46+

33% of blunders occur between move 26-35. Keep tension until that moment.

Error Heatmap

Where do most errors occur?

9

12

10

9

10

13

10

14

9

9

abcdefgh

Many

Few

Critical squares

h414 err

f513 err

c612 err

d510 err

f610 err

h4/f5 concentrate most errors. Force decisions in those zones.

Recent Games

D

Nugumanov, Bakhtiyar2290

Titled Tue 26th May 2026 · 26 May 2026

½-½

L

Razafindratsima, Timothe2546

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Di Berardino, Diego Rafael2465

Titled Tue 26th May 2026 · 26 May 2026

1-0

D

Papasimakopoulos, Alexandros2348

Titled Tue 26th May 2026 · 26 May 2026

½-½

W

Dinesh Rajan M2289

Titled Tue 26th May 2026 · 26 May 2026

1-0

W

Gustafsson, Jan2580

Titled Tue 26th May 2026 · 26 May 2026

1-0

Openings

Based on player games

Weaknesses

EXPLOIT!

White

No significant weaknesses detected as White

Black

No significant weaknesses detected as Black

Strengths

AVOID

White

Sicilian: d6 Systems

69.0%

261 Games·Wins

1.e4 c5 2.Nf3 d6

Slav: Semi-Slav

76.5%

17 Games·Wins

1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3

Black

Sicilian: d6 Systems

63.9%

327 Games·Wins

1.e4 c5 2.Nf3 d6

Catalan

77.8%

18 Games·Wins

1.d4 Nf6 2.c4 e6 3.g3

Critical Blunders

Tactical errors analyzed with Stockfish

10 errors

▶

#86f5??

Endgame

vs Terry

OTB·2026

▶

#44Bc4??

Endgame

vs Martinez Alcantara

OTB·2026

▶

#28Rxf4??

Tactics

vs Nakamura

OTB·2026

▶

#85Ke3??

Endgame

vs Le Tuan

OTB·2026

▶

#41Qf5+??

Endgame

vs Caruana

OTB·2026

▶

#33Bc8??

Tactics

vs Chirilov

OTB·2026

▶

#30Rd6??

Tactics

vs Mahdavi

OTB·2026

▶

#31Re4??

Tactics

vs Aravindh

OTB·2026

▶

#58Kc6??

Endgame

vs Andreasyan

OTB·2025

▶

#49h3??

Endgame

vs Sevian

OTB·2025

Endgame Statistics

23 endgame categories analyzed — discover where they collapse under pressure

Repertoire

☰ All

♟ Classical

⚡ Rapid

🔥 Blitz

PRO

·

2026

2025

2024

2023

2022

2021

PRO

8

7

6

5

4

3

2

1a

b

c

d

e

f

g

h

Starting Position

2924 Games

60%24%16%

Move	Games	Performance	%
1.e4 Strong	1603		74%
1.d4	958		70%
1.c4 Strong	173		73%
1.Nf3 Strong	145		72%
1.b4 Strong	30		88%
1.b3	5		70%
1.f4 Strong	4		75%
1.a3 Weak	2		0%
1.Nc3 Weak	1		0%
1.Nh3 Strong	1		100%
1.g4	1		50%
1.g3 Strong	1		100%

1.e4

74%

1603

1.d4

70%

958

1.c4

73%

173

1.Nf3

72%

145

1.b4

88%

30

1.b3

70%

5

1.f4

75%

4

1.a3

0%

2

1.Nc3

0%

1

1.Nh3

100%

1

1.g4

50%

1

1.g3

100%

1

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